Mahasu Pahari (Takri: 𑚢𑚩𑚭𑚨𑚱 𑚞𑚩𑚭𑚪𑚯) is a Western Pahari (Himachali, Takri: 𑚩𑚮𑚢𑚭𑚏𑚥𑚯) language spoken in Himachal Pradesh. It is also known as Mahasui or Mahasuvi. The speaking population is about 1,000,000 (2001). It is more commonly spoken in the Himachal Pradesh, Shimla (Simla) and Solan districts. It is to be known that Shimla and Solan were parts of the old Mahasu district. Himachal Pradesh State on 1 September, 1972 reorganised the districts dissolving Mahasu district. The Solan district was carved out of Solan and Arki tehsils of the then Mahasu district and tehsils of Kandaghat and Nalagarh of the then Shimla District of Punjab.